If you want to receive SMS, then it will receive SMS in only one phone randomly, you canât read Messages from Both Android Phones, Sometimes message delivers on both phones, & sometimes only on Single Phone.

How To Install & Use One Whatsapp Account on TwoPhones

At First, Make Sure you have rooted android Phone, & Titanium Backup app Installed in your Both Phone, If you have these 2 Things Ready, Then you can proceed to next steps

Make Sure, you have Already Installed Whatsapp account on Both Android Phones already, & Logged in with account in one phone, which you want to use on 2 Phones.